import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner reader =new Scanner(System.in);
        double sum =0;
        int m =0;
        while(reader.hasNextDouble()){
            double x =reader.nextDouble();
            assert x<=100&&x>=0:"数据不合理";
            m = m+1;
            sum =sum+x;
        }
        System.out.printf("%d个数的和为%f\n",m,sum);
        System.out.printf("%d个数的平均值是%f\n,m,sum/m");
    }
}